Cask



FIG. 1 is a front, left perspective view of a cask showing my new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a left-side elevation view thereof;

FIG. 5 is a right-side elevation view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is a rear, right perspective view thereof.

All broken lines represent portions of the cask that form no part of the claimed subject matter. 

CLAIM The ornamental design for a cask, as shown and described. 